chore: import upstream snapshot with attribution

docs/source/Introduction/installation.rst

@@ -0,0 +1,48 @@
+:github_url: https://github.com/AI4Finance-Foundation/FinRL
+
+Installation
+============
+
+Using pip:
+----------
+
+If you do not need to finetune the models, you can install the package without the finetune dependency:
+
+.. code:: bash
+
+    pip install -U FlagEmbedding
+
+If you want to finetune the models, you can install the package with the finetune dependency:
+
+.. code:: bash
+
+    pip install -U FlagEmbedding[finetune]
+
+
+Install from sources:
+---------------------
+
+Clone the repository and install
+
+.. code:: bash
+
+    git clone https://github.com/FlagOpen/FlagEmbedding.git
+    cd FlagEmbedding
+    # If you do not need to finetune the models, you can install the package without the finetune dependency:
+    pip install  .
+    # If you want to finetune the models, install the package with the finetune dependency:
+    pip install  .[finetune]
+
+For development in editable mode:
+
+.. code:: bash
+
+    # If you do not need to finetune the models, you can install the package without the finetune dependency:
+    pip install -e .
+    # If you want to finetune the models, install the package with the finetune dependency:
+    pip install -e .[finetune]
+
+PyTorch-CUDA
+------------
+
+If you want to use CUDA GPUs during inference and finetuning, please install appropriate version of `PyTorch <https://pytorch.org/get-started/locally/>`_ with CUDA support.